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+The highlight library used by the highlight plugin has many features that are not accessible through the ikiwiki format directive. I've created a patch that exposes the line numbering option and opens the door to expose other options more easily.
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+The patch is in a github branch here: <https://github.com/trapperhoney/ikiwiki/tree/linenumbers>
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+I made a test/demo of the feature here: <http://www.angrydoughnuts.com/temp/ikiwiki/>
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+And the updated plugin documentation is here: <http://www.angrydoughnuts.com/temp/ikiwiki/html/plugins/highlight.html>